Orange

France Telecom

Ahmed Saadani

Ghaya Rekaya

Eric Hardouin

Michael Dohler

Agisilaos Papadogiannis

Slim Ben Halima

Michel Nahas

Charlotte Hucher

Disclosed is a method of grouping transmitter-receiver pairs for communicating over a communications network. For each group of a set of groups of transmitter-receiver pairs, the pairs of the group execute an iterative interference alignment technique for I1 iterations on signals transmitted by the group. Each transmitter of the group successively sends a pilot signal that has been precoded by a matrix resulting from that execution. Each receiver of the group evaluates a metric representative of a distance between a vector subspace generated by the pilot signal transmitted by the transmitter with which it forms a pair and a vector subspace generated by interferences determined from the pilot signals transmitted by the other transmitters. A central unit calculates a global metric associated for each group on the basis of the metrics from the receivers of the group and selects from the set a group that optimizes the global metric.

Method of grouping transmitter-receiver pairs for communicating over a communications network

The invention relates to the selection of at least one dynamic node, in a mobile network, as a candidate for relaying a data communication signal between a transmitting entity and a receiving entity of the network. In terms of the invention: at least one first area around at least one first entity among the transmitting and receiving entities is defined, beyond which a data communication signal is attenuated beyond a first predetermined threshold; and the selection of nodes as possible candidates for relaying the communication signal on the basis of the definition of the first area is limited.

Selection of dynamic relays for cooperative communications in a mobile network

A method and apparatus are provided for transmitting frames of N&#x3e;2 symbols for use in a distributed system having at least two transmitter nodes. The method includes circularly permutating a frame of N symbols; multiplying m first permutated symbols by a phase coefficient &#x3c6;&#x2260;1, for 0&#x3c;m&#x2266;[N/2]+1; and one of the nodes transmitting the frame including the multiplied permutated symbols and another of the nodes transmitting the frame of N symbols.

Method of transmitting a digital signal in a distributed system, and a corresponding program product and relay device

A method is provided for communication between at least one source entity and one destination entity, in a cooperative network that includes a plurality of entities. The method includes a step of determining, for a given entity of the network, a temporal variation of an impulse response of a transmission channel established between the given entity and another entity. The method further includes: a step of determining a temporal variation of an impulse response of at least one global transmission channel intended to be established between the source entity and the destination entity and passing through at least one relay entity, on the basis of the temporal variations of the impulse responses of the transmission channels; and a step of selecting a global transmission channel from among the set of global transmission channels determined.

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Issy les Moulineaux, France

Ahmed Saadani